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Congratulations to Samantha Simonds of Southampton, England who correctly explained a boat’s sail-area-to-displacement ratio. “The SA/D offers a good estimate of a boat’s sailing performance. A high SA/D, say over 20, indicates a lot of sail area for a given displacement and higher sailing performance. Most cruising boats have an SA/D of around 15. It’s important to remember that the SA in the ratio is “working sail” and that’s the 100 percent fore triangle and mainsail, not the area of an overlapping genoa.”